DISTRIBUTEUR FIXE SEPARE EN SECTEURS POUR COMPRESSEUR DE TURBOMACHINE

FIXED GUIDE VANE ASSEMBLY SEPARATED INTO SECTORS FOR A TURBOMACHINE COMPRESSOR

Abrégé français

L'invention porte sur un ensemble d'aube directrice fixe comprenant un carter circulaire composé d'au moins deux parties (11) et des secteurs de soutien (5), chacun composé d'un segment interne (7) et d'un segment externe (6) raccordés par des aubes (8). Les parties du carter et les secteurs de l'ensemble d'aube directrice sont retenus ensemble par un système formant une coulisse et d'une pièce coulissante. Un dispositif anti-rotation (30) est fourni pour empêcher les secteurs de tourner autour du carter.

Abrégé anglais

The invention relates to a fixed guide vane
assembly comprising a circular casing composed of at
least two parts (11) and supporting sectors (5), each
composed of an inner segment (7) and an outer segment
(6) connected by vanes (8). The parts of the casing
and the sectors of the guide vane assembly are held
together by a system forming a slide and a slider.
Anti-rotation means (30) are provided to prevent the
sectors from rotating with respect to the casing.

Revendications

8
CLAIMS
What is claimed is:
1. A vane assembly for a compressor, comprising:
sectors each having an inner segment and an outer
segment connected by vanes;
a casing configured to support the sectors in
contact with each other; and
an anti-rotation lock between two adjacent sectors
and configured to prevent said sectors supported by the
casing from rotating;
wherein said anti-rotation lock has an edge
configured to fit into a groove of said casing and a pin
on said edge configured to fit into a notch in said
casing.
2. A vane assembly according to claim 1, wherein
said sectors and said anti-rotation lock are in a shape
of an arc of a circle.
3. A vane assembly according to claim 1, wherein
the casing is composed of two parts.
4. A vane assembly according to claim 3, wherein
said two parts are in a form of a semi-circle.
5. A vane assembly according to claim 3, wherein
said two parts are in contact with each other.

9
6. A vane assembly according to claim 5, wherein
said two parts are fixed to each other at joint planes.
7. A vane assembly according to claim 1, wherein
the casing comprises two radial sides facing each other.
8. A vane assembly according to claim 1, wherein
said casing is circular.
9. A vane assembly according to claim 1, wherein
said edge is an outer edge of said anti-rotation lock.
10. A vane assembly according to claim 1, wherein
said edge is an inner edge of said anti-rotation lock.
11. A vane assembly according to claim 1, wherein
said anti-rotation lock comprises an inner edge and an
outer edge, each edge being configured to fit into a
groove of said casing.
12. A vane assembly according to claim 11, wherein
each of said inner and outer edges has a pin configured
to fit into a notch in said casing.
13. A vane assembly according to claim 1, wherein
said groove has a height that enables passage of said
edge with said pin.

Description

CA 02409972 2002-10-28
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FIXED GUIDE VANE ASSEMBLY SEPARATED INTO SECTORS FC>R A
TURBOMACHINE COMPRESSOR
DESCRIPTION
Technical domain
The invention presented herein concerns the high
pressure turbine of a turbomachine such as a turbojet
used on an aircraft. More precisely, it concerns a
fixed guide vane assembly separated into sectors for a
turbomachine compressor.
State of prior art
There is a very large variety of compressors for
turbomachines. Manufacturers efforts are being made to
improve performances, and also to improve
manufacturing, reduce costs and ease of maintenance..
One known improvement consisted of separating the
fixed guide vane assembly of the compressor for a
turbomachine into sectors. Patent US-A-4 126 405
divulges a segmented assembly of a turbine distributor.
Document FR-A-2 728 015 divulges a turbine stator
distributor comprising sectors each composed of an
inner segment and an outer segment connected together
by vanes. A casing built into the compressor stator
will support the sectors placed in contact with each
other. Anti-rotation means are provided to prevent
rotation of the sectors supported by the casing.
Presentation of the invention
This invention was designed to further improve
manufacturing and the cost of a fixed guide vane
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assembly for a turbo-machine compressor. This is done
by making the casing in two or more parts, to
facilitate manufacturing. The parts of the casing and
the guide vane assembly sectors are held together ~y a
slide and slider system. Means of preventing rotation
are provided to prevent the sectors from rotating with
respect to the casing.
Therefore, the purpose of the invention is a fixed
sectorized guide vane assembly for a compressor :gin a
turbo-machine comprising:
- sectors in the shape of an arc of a circle each
composed of an inner segment and an outer
segment connected by vanes,
- a circular casing integrated into the compressor
stator, that will support the sectors in contact
with each other,
- anti-rotation means designed to prevent sectors
supported by the casing from rotating,
characterized in that:
- the casing is composed of at least two parts, in
contact with each other and fixed to each other
at joint planes and including means forming a
slide,
the sectors form slider means adapted to the
means forming a slide in the parts of the
casing,
- and anti-rotation means comprise anti-rotation
means fixed to the joint planes of the parts of
the casing by attachment means, and anti-
rotation means blocked on the parts of the
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casing by locking means at the contact between
the sectors.
Preferably, the casing is composed of two parts in
the form of a semi-circle.
According to one preferred variant embodiment, the
casing comprises two radial sides facing each other,
the means forming a slide comprise two opposite grooves
formed in the sides, the edges of the outside segments
of the sectors forming means forming a slide.
The anti-rotation means fixed to the joint planes
may then comprise at least one strip held immobile
between the two grooves by the said attachment means
and forming a stop for a sector sliding in a slide in a
casing. This strip may be a two-arm clip inserted by
bringing the two arms towards each other in the
reception housings provided in the grooves, and fixed
in place in these housings by releasing the two arms,
thus forming the said attachment means. The anti-
rotation means fixed to the joint planes may also
comprise at least one anti-rotation lock composed of an
element comprising means forming a slider adapted to
the means forming a slide in the parts of 1=he casing,
the element also comprising immobilization means on the
casing. These immobilization means may be of mortise
and tenon type, with a tenon engaging in the mortise
when the element is pushed in a direction perpendicular
to the direction in which the element slides in the
casing, thus forming the said attachment means. One of
the ends of the outer segment of the sector adjacent to
the said element may have a clearance such that the
element can be pushed into the said perpendicular
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direction when this adjacent sector is slid to come
into contact with the said element.
The anti-rotation means blocked on the part: of
the casing may then comprise at least one anti-rotation
lock formed of an element comprising means forming a
slider adapted to the said means forming a slide in the
parts of the casing, the element also comprising
immobilization means on the casing. These
immobilization means may be of the mortise and tenon
type, the tenon fitting into the mortise when the
element is pushed in a direction perpendicular to the
direction in which the element slides in the casing,
thus forming the said blocking means. One of the ends
of the outer segment of a sector adjacent to the said
element have a clearance such that the element can be
pushed in the said perpendicular direction, when this
adjacent sector is slid to come into contact with the
said element.
Brief description of the drawings
The invention will be better understood and other
advantages and special features will become clear after
reading the following description given as a :non
limitative example, accompanied by the atta~~hed
drawings among which:
- figure 1 is a partial sectional view of a tu:rbo-
machine compressor using a fixed sector.ized
guide vane assembly according to the invention,
- figure 2 is a partial oblique view of a faxed
sectorized guide vane assembly according to the
invention,
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figure 3 is an oblique view of an anti-rotaJ_ion
lock for the joint plane of part of a casing for
the fixed sectorized guide vane assembly
according to the invention,
5 - figure 4 is an oblique view of an anti-rota~ion
lock placed between two sectors of a faxed
sectorized guide vane assembly according to the
invention,
- figures 5 and 6 illustrate two steps in the
placement of an anti-rotation lock between two
sectors of a fixed sectorized guide vane
assembly according to the invention.
Detailed description of embodiments of the invention
Figure 1 is a partial sectional view of the
compressor of a turbomachine using fixed sector:ized
guide vane assemblies l, 2 and 3 according to the
invention. These guide vane assemblies are
functionally identical.
We will describe guide vane assembly 1 rnore
precisely. It comprises a circular casing 4 integrated
into the compressor stator and supporting sectors such
as sector 5.
A sector 5 is composed of an inner segment 7 and
an outer segment 6 connected to each other by vanes 8.
Figure 2 is a partial and exploded view of the
sectorized fixed guide vane assembly 1. For example,
it comprises a casing in two parts in the form of a
semi-circle. Figure 2 shows a partial view of one of
the parts 11 of this casing with one of its joint
planes 12 that will be fixed on the corresponding joint
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plane of the other part of the casing. Three sectors 5
currently being assembled are represented. For a
sector 5, the outer segment 6, the inner segment 7 and
the connecting vanes 8 can be recognized.
The part of the casing 11 comprises two radial
sides 12 and 13 facing each other and each provided
with a groove. The grooves are facing each other to
form a slide. The edges 21 and 22 of the outer segment
6 of the sector 5 project outwards to act as a slider
free to slide in the slide formed by the part of casing
11.
Before engaging a first sector 5 onto the part of
the casing 11, an anti-rotation lock is installed on
the joint plane 12 of the part of the casing 11. This
may be a strip or lock such as that shown in figure 4.
Figure 2 also shows an anti-rotation lock 30
placed
between
two
sectors
5.
This
lock
30
is
shown
in
an oblique view in figure 3. It is formed of an
element
31
placed
between
the
two
sides
12
and
13
of
the part of the casing 11 (see figure 2). 'rhe element
31 is in the shape of an arc of a circle and is
continued
by
an
outer
edge
32
and
an
inner
edge
33.
The edges 32 and 33 are designed such that the locls
30
can slide in the grooves of the part of the casing 11.
The outer edge 32 comprises a pin 34 projecting from
the plane of the element 31. The same is applicable
for the pin 35 on the inner edge 33.
Figures 5 and 6 illustrate two steps in the
placement
of
an
anti-rotation
lock
between
two
30 sectors
5.
A
single
one
of
the
sides
of
the
part.
of
the casing 11 has been shown to facilitate
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understanding. The groove 14 provided in this side can
be seen.
Figure 5 shows a first sector 5 already installed
(at the left of the figure) and a second sector .'i in
the process of being installed (at the right of the
figure). A lock 30 was inserted between these two
sectors by sliding. It will be noted that the height
of the groove 14 enables the passage of the outer edge
of lock 30 with its pin 34.
The element 30 slides until it comes into contact
with the first sector 5. For element 30, this
corresponds to a relative position with respect to the
part of the casing 11 such that the pin 34 is facing a
notch 15 machined in the part of the casing 11. All
that is necessary then is to push upwards on the lock
30 (for the view shown in figures 5 and 6) so that the
pin 34 can penetrate into the notch 15, and the lock 30
then stays in the raised position.
The second sector 5 may then be pushed towards the
lock 30. This second sector 5 has a clearance 23 at
the end in contact with the lock 30, such that pari~ of
the outer segment 6 passes under the lock 30.
The anti-rotation lock 40 at the joint plane szown
in figure 4 is installed in the same way as the lock in
figure 3. It is formed of an element 41 that is pl,~ced
between the two sides of the part of the casing. The
element 41 is continued by an outer edge 42 and. an
inner edge 43. The outer edge 42 comprises a pin 44
projecting from the plane of the element 41. The name
is true for the pin 45 on the inner edge 43.
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Dessin représentatif